Physics runs in a separate thread from rendering in PhysicsServerExample (preliminary)

Improve rendering performance. OpenVR experience is smooth now.
commit needs a bit more testing before pushing in main repo.

examples/SharedMemory/PhysicsServerSharedMemory.cpp

@@ -90,6 +90,11 @@ PhysicsServerSharedMemory::~PhysicsServerSharedMemory()
 	delete m_data;
 }
 
+void PhysicsServerSharedMemory::resetDynamicsWorld()
+{
+	m_data->m_commandProcessor->deleteDynamicsWorld();
+	m_data->m_commandProcessor ->createEmptyDynamicsWorld();
+}
 void PhysicsServerSharedMemory::setSharedMemoryKey(int key)
 {
 	m_data->m_sharedMemoryKey = key;